Why every time i shunt down or wake up my mac, the Wi-Fi connection will lose and can't connect automatically back to the Wi-Fi, But I can still connect to Wi-Fi manually. PS. My home router is 108.2 N  and my mac is using 108.2 AC.

HI,
I got a question that quite annoying, For every times I start or  wake up my comouter, the wi-fi will lose the conntetion automatically.
My mac is using Wi-Fi AC but my router is using Wi-Fi N, will that cause a problem ? My other mac that is using wi-Fi N is work perfect with the Internet .
Thank you for answer the qustion.

Not sure if your problem is exactly the same as in the following thread, but JAHelms posted a fix that seemed to help quite a few people:
https://discussions.apple.com/thread/4342982?tstart=0
If that doesn't help, here are some other troubleshooting suggestions:
http://osxdaily.com/2012/11/30/resolving-stubborn-wi-fi-connection-problems-in-m ac-os-x/

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